Air-compressor.



M. MINTZ.

AIR COMPRESSOR.

APPLIOATION FILED DBo.2.19oe.

Patented Aug. 13,1912.

4 SHEETSWSHEBT 1.

yM. MINTZ.

AIR COMPRESSOR.

APPLICATION FILED DBO. 2, 1908,

Patented Aug. 13,1912.

, 4 SHEBTS--SHEET 2.

, ,Z Y /Zz ffm/9,505

u. MINTZ. AIR COMPRESSOR.

APPLICATION FILED DEO. 2, 1903.

Patented Aug. .1 3, 1912 4 SHBETS- SHEET 3 M. MINTZ.

MR COMPRESSOR.

APPLIOATION FILED 132012, 190e.

Patented Aug. 13, 1912.

- To all whom it may concern.'

. useful Improvement in Air-Compressors, of

vrectly on the rotor shaft.

ldevice in operative position.

proper shown is of a single phase type MlKE MINTZ, OF ROCK ISLAND, ILLINGIS.

" Arnrcoiarnnssen.

Lett-:rs Patent.

Specification of Patented Aug'. 3. 1.9i?.

Application le mecember 2, 1908. Serial No. 465,629.

-Be it known that. I, Mimi MIN'rz, a citizen o' the4 United States of America, and resident of Roel; Island, Rock Island county, Illinois, have invented a certain new and which the following is a specification.

My invention relates to improvements in air compressors, and has for its object the production ot a device utilizing an electric .motor in which the pumps can be geared di- A further object is the utilization of improved valve means, where-bythe motor may be caused to start'immediately against any pressure.

A further obje-:t is the utilization in al device of the class I lescribed ot' a vert-ical rotor directly geared to a pui'nping mechanism that can be immediately started regardless of the starting torque of the motor.

A further object is the utilization of certain new and useful improvements in valves, switches and oilers, which will be clearly set forth in'ithe accompanying speciticaftionr a nd illustrated by the drawings, in. which Figure l represents an end elevation ol.' my Fig. 2 repre sents a side elevation of my device. Fig. 8 represents a sectional view through the center of Fig. 1. Fig. 4 represents a sectional Viewon the'line 4 4- of Fig. 3, looking in the direction indicated by the arrows. Fig. 5 represents a sectional View on the line 5--5 of Fig. 23, looking in the direction indicated by the arrows. Fig.` (l represents a sectional View on the line (56 ot Fig. 5, looking in the direction indicated by the ar rows. Figs. 7, 8 and 9 represent perspective views of details of Fig. 5. Fig. 10 represents a sectional view on'the line llL-l() of Fig. 3, looking in the direction indicated by the arrows. i

Lilie numerals of reference indicate like parts in the several igures otl the drawings.

Referring new to the drawings, and especially to Fig. 1, 11 represents a motor; 12 4a pair of pumps connected therewith; 13J a diaphragm valve controlling the admission of air to the tank 14; and l5 represents a switch by means of which the current to actuate the motor is automatically cut in and out at predetermined times. The motor for alternating currents and comprises a case 16, a field 17 and a rotor 18. support 19 secured to the case or .traine 16, so the motor may stand in a vertical position.'v The armature ring 20 of the rotor has been turned down, leaving a full clearance be tween the armature and the field. Un the opposite sides of the frame are screwed brackets 2l, on which are mounted the pumps 12. A crank arm 21ais mounted on the rotor shaft 22, and the .lower end of the piston rod 23 is mounted thereon. The piston head' 24 moves within the cylinder 25. Seated on a bracket 26, mounted on the frame, is an oil receptacle 27 justbelow the open end of the cylinder 25.A A small strip of metal `28 is mounted on the lower side of the piston head 24 and adapted to pass witin the oil receptacle on the down stroke. This strip is so positioned that it bea-rs against the side of the cylinder when wi thin the cylinder, thus depositing a sniall quantity of oil on the inside of the cylinder at each stroke. The cylinder head 29 is provided with two passages, one 30 communieating with the air compressor, and the other 3l communicating with a valve 32, opening to the atmosphere. This valve ccmprises a. ball 33, a-stop 34, a seat 35 and a passage 3G to the atmosphere or any 'other desired source ot supply. The passage 30 of each pump comniunicates with a pipe 37. An ordinary valve 38, comprising a casing, a ball 39, a stop 40, and a seat 4l, controls the passage of air from the pump to the tube 37 on the path to the compressed air tank.l The diaphragm valve i3 is shown above'the motorand comprises a lower shell vor casing 42, an upper shell or cover 43, and -a diaphragm 44.

of the post .d'9 on which is mounted a valveseatit. The top lot" the upper shell or cover 43 also terminates in a. hollow stein 53, within which i; screwed a lower stem 54- ot' a diaphragm casing 55. A tube `5G tits within these stems, the upper end passing into the stem 54, and the lower end being constricted, at 57 and passing through the diaphragm 44, and seating on the valve-seat 52. It will vthus be'evident that when the diaphragm is titl valve-seat support 51 is screwed on the top down, as shown in Fig. 8, communication between the ripper and middle ,chambers 5859 is eut oil'. Located within the diaphragm case, below the liaphragm, are a pair of circular disks -61, prox ided with openings 02. These disks are ot ditl'erent diameters, leaving a space between the dd- ]'acent surfaces which is tilled with absorbent material, as shown at 03. These two disks 'understood subdivide the chamber below the diaphragm into a middle chamber 59 and a lower chamber 04. The tube 5G extends within the passage G5, in the switch diaphragm case stem 66, from which a pipe 07 communicates with the tank or receptacle 14.

Referring now more particularly to Figs. 8, 5, G, and 8. 'lhe switch 15 comprises an outer casing (58 within which is secured a bracket (39, of insulating material, on which is seated a pair ot mercury orv other contacts 70. Communicating wires 71 from a source ot electricity, not shown, are secured to the contact posts 72. A bell crank lever 'T55 comprising a graduated arm 74, extending outside the casing and provided with a weight To, is pivoted at 76; the other arm T7 extends ulinvardly and is turned over, as shown at T8, forming a linger adapted to actuate the circuit closing device. Pivotally mounted within the casing at 79 is an oscillatory member 80 provided with a pair of stops LSL-82. One end 83 ot the arc of this member is arranged to strike against a shoulder 8,1 secured to the case, while the opposite `terminates in an insulating button 85, to which is secured a forked connection 8G. rl`he endsST and 88 of this connection are adapted to enter the mercury contacts T0 when the member 80 is oscillated. B [ouuied on the salue pivotal point 79, as the member 80, is a striking arm or lever S9, provided with a ball or weight 99. At the lower end, this arm is extended below the pivot, 79 into a fork or yoke, the arms 9] 9'2 of which are adapted to be al` ternately engaged by the linger 78 to work the lever 89. This lever works between the stops 8l*-82 which are so located as to be at all times on opposite sides oit a vertical line through the pivot 79. The diaphragm case 55 is located between the switch case. and the pipe leading to the tank, and is divided into an upper and lower chamber 9?-Y-9-l, separated by a diaphragm 05. A `toot 90 provided with a rod 9T passes through the top of the diaphragm casing. and extends into the switch casing, the lever 7dY resting on the end 98 at a point between the pivotal point 7G and the weight. lt is that the switch casing is screwed or secured to the top of the diaphragm casing by a threaded nipple 99, or in any desired manner, leaving a free passage 100 t'or the rod 97. A small rport or passage 101 is provided communicating with the vinterior of the diaphragm casing 1:5 below the diaphragm, the purpose of which will be explained later. Any surplus oil that may find its way, or be forced in suspension in the air within the lower diaphragm chamber, may be prevented from passing upwardly by the absorbent disk 63, and collects at the bottom of the chamber where it may be drawn otf by means of a ,valve or passage indicatedat 104.

Referring now to the operation of my device, let us consider the tank empty -1 d. the motor at rest, the switch being 1n the position indicated by dotted lines in Fig. 3. The switch is thrown, closing the circuit to the motor and starting it into operation. The pressure Within the diaphragm chambers and passages being atmospheric, the starting torque of the motor is suicient to start the motor without ditliculty. The pump being geared directly tothe rotor shaft, then opens the valve 39, forcing the air into the lower diaphragm chamber 64 through the filtering medium and into the middle chamber 59. "hen the ressure reaches a predetermined point, t e diaphragm rises against the pressure of the spring 102, unseating the valve 57 from the seat 52, thus permitting the air to pass through the tube 56 and pipe 67 tio the compressed air tank. Vhen the pressure reaches, a predetermined point, it raises the diaphragm 95, carrying the rod v'97,y and raises the lever 74, thus trippin the switch. This operation in detail is as ollows The raising of the lever 74 presses .the finger 7 8 againstl the member 92, forcing the weighted arm 89 from the sto 81 and toward the stop 82. As soon as t e arm passes the vertical line,.passing through the pivotal point TG, the weight 90 causes it to drop by gravity against the stop 82, thus moving the member 80 into the position shown in the dotted lines' in Fig. 3. This breaks the circuit and stops the operation of the motor. The supply of compressed air within the tank is now used yuntil the pressure is reduced to such a point that the weight on the lever 74 trips the arm 89 against the stop 81, thus closing the circuit and putting the motor again in operation. While the contents ot the tank are heilig used and the motor at rest, the high prcssure\on the under side of the diaphragm 44 ils removed apd 4the spring 102 forces 4it down, temporaril)Y seating the valve 57,'and closing communiration betweenfthe systeni above and below the dia hragm.y The pressure on the upper side o the diaphragm relieves the spring and holds thevalve 1n place after it is once seated. The compressed air within the system between the closed rpump valve 38 andthe diaphragm 44 then begins to leak out through the port or passage 101 (not shown), which is very small; an imperfect noemer 3 lthreadon-a mrew might be suioient for this .ipupeabllt in anyievent means are confl-wfnpltd and plrovided whereby, during AKAthep'eriod that t l el yinotor is at restl and the compressed air being used from the tank or receptacle, the pressure 'within the lower Aof the system, as above defined, is

reduced to that ofthe atmosphere. It will ;tl1 us"be'seen `that regardless of the pressure ,within ythe tank, or the required pressure necessary to trip the switch and start the ymotor, there is no' 4pressure other than atmospheric below the diaphragm 'to oppose bar rooms.

` the starting torque of the motor, thus insuringfat all times the prompt starting of the moto/r.

" It is evident that this mechanism can be regulated as to automatically shut oit the cur-rent ywhen any desired f, the tank is reached, and a so arranged so ressure Within that when the pressure Within the tank flows to -a predetermined point, the switch opcrates to start the motor in operation again.

Compressed air is used very commonly by `artists and lithographers in the makingl of Wash drawings, and the use of air brushes,

by physicians for atomizers, by berbere, for pyrography points, by dentists, and a Very common use is for the raising of beer in It would also. be most convenient and desirable as a means of inflating automobile tires. Heretofore it" has been a common practice in the mostsuccessful devices now in use for generating this air would be automatically'started operating the pump and again raising the pressure to the maximum, and automatically shut off the-current.' It must be understood that all of these uses cit-ed above, would necessitate but .a very light power,\the motors generally used being of but one-eighth and one-quarter horse power. The motQr/i'iias generally of the rotary tan type and of comparatively high speed. So higheis the speed of these motors thatitfrw'onld be impractical to con nect these air pilmps direct to the armature shaft, necessitating the use of some other means of decreasing;r the speed-in other Words, oi' gearing back. Again, as the alterna tinfbr current is most commonly used Jfor lighting' oltice buildings and other places Where this compressed air would likely be used, the induction motor would of necessity beused. New, as thc starting torque of an alternating motor is so Weak, no motor of an eighth or quarter horse power could 'possibly start against a load equal to compressed air at twenty, thirty or forty pounds, or even lless. All these objections are practically overcome in my invention, vand an eiiicient and durable motor of positive action is the result.

It is evident that this system can be used in lestablishing a vacuum chamber, instead of storing a chamber with` compressed air, it being only necessary to reverse the operation and malle simple changes in the relative positions of the parts -of the valves within the-chambers.

Of course, it is' understood that I do not limit myself to the use ot an alternating current motor7 but can, if desired, use a direct current motor or light power.

The 'diaphragm valve shown and described in this application is not claimed yspecifically herein, but is claimed in my co pending ap lication Serial Number 465,628, filed Decem r 2, 1908.

I claim l. In an air compressor, the combination with a motor, pumps, a compressed air tank, a diaphragm valve interposed between said pumps and tenir, and means for reducing the pressure in the system between the pumps and diaphragm valve to atmospheric regardless of the pressure in the remainder of the system.

2.- In an air compressor, the combination with a motor, pumps, a compressed air tank, a diaphragm valve interposed between said pumps and tank', means for reducing the pressure in the system between the pumps and diaphragm Valve to atmospheric regardless of the pressure in the remainder of the system, and means located within the casing of said diaphragm valve for purifying the air passing therethrough.

3. In an air compressor, the combination with a motor, .pumps geared directly to the shaft of said motor, a compressed air tank,

a diaphragm valve interposed between said pumps and'tank, and means for reducingv the pressure in the system between the pumps and diaphragm valve to atmospheric regardless of the pressure in the remainder ol the system. ,l

4. lIn an aircompressor, ythe combination with a motor, pumps geared directly to the shaft of saidfmotor, a compressed air tank, a diaphragm Valve interposedbetwcen said pumps and tank, meansv for reducingthe pressure in the system betweenthe pumps and diaphragm Valve to atmospheric regardless of the pressure in the remainder of thc system, and means located Within the casing of said diaphragm valve for purifyingthc air passing therethrough.

ln an airA compressor, the combination with a motor, comprising a magnetic field and a, vertical rotor, pumps, a compressed air tank, a diaphragm valve interposed between said pumps and tank, and means for the pumps and diaphragm valve to atmosrv pheric regardless of the pressure in the remainder of the system.

6. In an air compressor, the combination with a. motor, comprising a magnetic field and a vertical rotor, pumps, a compressed Vair tank, a diaphragm valve interposed between said pumps and tank, means for reducing the pressure in the system between the pumps and diaphragm valve to atmospheric regardless of the pressure in the remainder of the system, and means located within the casing of said diaphragm valve means for reducing the pressure in the system between the pumps and diaphragm valve to atmospheric regardless of the pressure in the remainder of the system.

S. In an air compressor, the combination with a motor, comprising a stationary magnetic field and a rotor, pumps geared directly to the shaft of said rotor, a compressed air tank, a diaphragm valve interposed between said pumps and tank, means for reducing the pressure in the system between the pumps and diaphragm valve to atmospheric regardless of the pressure in the remainder of the system, and means lo cated within the casing of said diaphragm valvel for purifying the air passing therethrough.

9. In an air compressor, a motor, com-.- pression means, a compressed air tank, a. chamber adjacent thereto through which the air passes on its way to the tank, valve means interposed between said motor and said tank, a leak located on one side of said valve of such character as not to aitect the operation of the device while the air is being compressed but sutiicient to restore the pressure to atmospheric on one side when the motor is at rest.

10. In an air compressor, a motor, compression means, a compressed air tank, valve means located between said tank and motor, a 'leak in the air passage on one side of said valve of such character as not to affect the operation of the device when the air is being compressed but suiiicient to restore the pressure to atmospheric on one side when tue motor is at rest.

1l. In'an air compressor, the combination with a motor, pumps, a compressed air tank,"

a diaphragm valve interposed between said pumps and tank, and means tor restoring atmospheric pressure 1n the system between the pumps and diaphragm Valve regardless of the pressure in the remainder of the system.

l2. In an air compressor, the combfnation with a motor, pumps, a compressed air tank, a diaphragm valve interposed between said pumps and tank, means for restoring atmospheric pressure in the system between the pumps and diaphragm valve regardless of the pressure in the remainder o1 the system, and means located within the casing of said diaphragm valve for withdrawing impurities from the air kissing therethrough.

13. In an air pump, the combination with a motor, pumps, an air tank, a diaphragm .valve interposed between said pumps and tank, and means for restoring atmcspheric pressure in the system between the pumps and diaphragm valve regardless of the pf sure in the remainder oi' the system` 14. In an air pump, the combination with a motor, pumps, an air tank, a dia' )hragn'i valve interposed between said pun'fps and tank, means tor restoring atmospheric pressure in the system between the pumps and diaphragm valve regardless of the pressure in the remainder oi the system` and means located within the casing of said diaphragm valve for withdrawing impurities from the air passing therethrough.

l5. In an air compressor, the combination with a motor, pumps, a compressed air tank, a diaphragn'i valve interposed between said pumps and tank, means for restoring atmospheric pressure in the system between the pumps and diaphragm valve regardless of the pressure in the remainder of the system). and means for withdrawing impurities and vapors from the air passing therethrough.

1G. In an air pump, the combination with a motor, pumps, an air tank, a diaphragm valve interposed between said pumps and tank, means for restoring atmospheric pressure in the system between the pumps and diapluagnx valve regardless of the in'essure in the remainder of the system, and means for withdrawing impurities and vapors from the air passing therethrough.

17. In an air pump, a motor, pumps, an air tank. valve means located between said tank and motor, a leak in the air passage on one side of said valve of such character as to not aflect thc operation of t: device when the machine is running but suiiicient to restore atmospheric pressure on one side when the motor is at rest.

Signed by me at Chicago, Illinois, this 30th daypl October' 1908.

MIKE MINTZ.

IVi tnesses CLARENCE E. TAYLOR, J. Nonni'. 

